Closing the Helium-3 Supply Gate

Building a fuel supply from nothing at terrestrial scale: a breeder fleet first, then lunar helium-3 as burner fleets grow.

Two reservoirs, in order

The ~400x supply gap is closed in two phases. First, a breeder fleet: each Hyperion breeds tritium that decays to helium-3, so burner fuel is produced domestically rather than bought. Second, as burner fleets scale beyond what breeders can feed, lunar helium-3 becomes the reservoir of last resort — a multi-decade dependency, not a near-term one.

Why order matters

The breeder produces the first kilograms; without it there is no burner fuel at all. Lunar recovery is only sensible once demand exceeds what a breeder fleet can supply, and its own logistics are unproven. Sizing the breeder fleet to the burners it feeds is the near-term engineering task.

Inventory discipline

Because every gram is bred, none can be wasted. Tight fuel accountancy and low-loss handling are part of closing this gate, not an afterthought.

Sequencing the two reservoirs correctly is itself part of closing the gate. Breeders must be built and reach FOAK before any burner fuel exists, so the near-term engineering task is sizing the breeder fleet to the burners it feeds. Lunar recovery is only rational once demand outgrows that fleet, and its own logistics remain unproven, so it anchors the long horizon rather than the near one.

See lunar dependency timeline and helium-3 from the breeder.